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Search: id:A056518
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| A056518 |
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Number of primitive (period n) periodic palindromic structures using exactly two different symbols. |
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+0
1
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| 0, 1, 1, 2, 3, 4, 7, 10, 14, 21, 31, 42, 63, 91, 123, 184
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OFFSET
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1,4
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COMMENT
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For example, aaabbb is not a (finite) palindrome but it is a periodic palindrome. Permuting the symbols will not change the structure.
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REFERENCES
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M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
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FORMULA
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A056513(n)-A000007(n-1).
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CROSSREFS
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Cf. A056481.
Sequence in context: A062426 A035565 A056513 this_sequence A160644 A145467 A039841
Adjacent sequences: A056515 A056516 A056517 this_sequence A056519 A056520 A056521
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KEYWORD
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nonn
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AUTHOR
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Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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